*{
    padding:0;
    margin:0;
}
form{
    width: 340px;
    height:550px ;
    background-color: rgb(64, 150, 200);
    margin:50px auto;
    font-size:16px;
    color:#fff;
}
input{
    display: block;
    margin:0 auto;
    outline: none;
    width: 220px;
    height: 30px;
    border:0;
    border-radius: 4px;
    text-indent: 10px;
    /* 给input框的光标设置颜色 */
    caret-color: blue;
}